would u be tipping it to make it taller? ive seen peeps do this but keep in mind that this changes the weight distribution of the tank. like it might be top heavy, so u gotta really secure the base to make sure it won't tip over. also U gotta really secure the lid so it won't fall off.
It'd be flat on the side like this(I used a ten gallon I keep in handy as an example) My only problem would be lighting(Since I use that especially for the heat)